<template>
  <el-menu
    :default-active="activeMenu"
    mode="horizontal"
    @select="handleSelect"
  >
<!--    <template v-for="(item, index) in topMenus" v-if="index < visibleNumber">-->
    <template v-for="(item, index) in topMenus">
      <!-- 仅包含一级菜单 -->
      <el-menu-item :style="{'--theme': theme}" :index="item.path" :key="index"
                    v-if="hasOneShowingChild(item.children,item)">
<!--        <svg-icon :icon-class="item.meta.icon" />-->
        {{ item.meta.title }}
      </el-menu-item>
      <!-- 有二级菜单的项 -->
      <el-submenu :style="{'--theme': theme}" :index="index + ''" v-else popper-append-to-body>
        <template slot="title">
<!--          <svg-icon :icon-class="item.meta.icon" />-->
          {{ item.meta.title }}
        </template>
        <template v-for="(child, s_indesx) in item.children">
          <el-menu-item
            :index="child.path"
            :key="`${index}_${s_indesx}`">
<!--            <svg-icon :icon-class="child.meta.icon" />-->{{ child.meta.title }}</el-menu-item>
        </template>
      </el-submenu>
    </template>

    <!-- 顶部菜单超出数量折叠 -->
<!--    <el-submenu :style="{'&#45;&#45;theme': theme}" index="more" v-if="topMenus.length > visibleNumber">-->
<!--      <template slot="title">更多菜单</template>-->
<!--      <template v-for="(item, index) in topMenus">-->
<!--        <el-menu-item-->
<!--          :index="item.path"-->
<!--          :key="index"-->
<!--          v-if="index >= visibleNumber"-->
<!--        ><svg-icon :icon-class="item.meta.icon" />-->
<!--          {{ item.meta.title }}</el-menu-item-->
<!--        >-->
<!--      </template>-->
<!--    </el-submenu>-->
  </el-menu>
</template>

<script>
import { constantRoutes } from "@/router";

export default {
  data() {
    return {
      // 顶部栏初始数
      visibleNumber: 5,
      // 是否为首次加载
      isFrist: false,
      // 当前激活菜单的 index
      currentIndex: undefined
    };
  },
  computed: {

    theme() {
      return this.$store.state.settings.theme;
    },
    // 顶部显示菜单
    topMenus() {
      let topMenus = [];
      this.routers.map((menu) => {
        if (menu.hidden !== true) {
          // 兼容顶部栏一级菜单内部跳转
          if (menu.path === "/") {
            topMenus.push(menu.children[0]);
          } else {
            topMenus.push(menu);
          }
        }
      });
      return topMenus;
    },
    // 所有的路由信息
    routers() {
      return this.$store.state.permission.topbarRouters;
    },
    // 设置子路由
    childrenMenus() {
      var childrenMenus = [];
      this.routers.map((router) => {
        for (var item in router.children) {
          if (router.children[item].parentPath === undefined) {
            if(router.path === "/") {
              router.children[item].path = "/redirect/" + router.children[item].path;
            } else {
              if(!this.ishttp(router.children[item].path)) {
                router.children[item].path = "/redirect" + router.path + "/" + router.children[item].path;
              }
            }
            router.children[item].parentPath = router.path;
          }
          childrenMenus.push(router.children[item]);
        }
      });
      return constantRoutes.concat(childrenMenus);
    },
    // 默认激活的菜单
    activeMenu() {
      const path = this.$route.path;
      let activePath = this.defaultRouter();
      // if (path.lastIndexOf("/") > 0) {
      //   console.log("activeMenu0" + path)
      //   const tmpPath = path.substring(1, path.length);
      //   console.log("activeMenu0" + activePath)
      //   activePath = "/" + tmpPath.substring(0, tmpPath.indexOf("/"));
      // } else
      if ("/index" == path || "" == path) {
        if (!this.isFrist) {
          this.isFrist = true;
        } else {
          activePath = "/redirect/index";
        }
      } else {
        activePath = "/redirect".concat(path);
      }
      var routes = this.activeRoutes(activePath);
      if (routes.length === 0) {
        // activePath = this.currentIndex || this.defaultRouter()
        this.activeRoutes(activePath);
      }
      console.log(activePath)
      return activePath;
    },
  },
  beforeMount() {
    window.addEventListener('resize', this.setVisibleNumber)
  },
  beforeDestroy() {
    window.removeEventListener('resize', this.setVisibleNumber)
  },
  mounted() {
    this.setVisibleNumber();
  },
  methods: {
    // 根据宽度计算设置显示栏数
    setVisibleNumber() {
      const width = document.body.getBoundingClientRect().width / 3;
      this.visibleNumber = parseInt(width / 85);
    },
    // 默认激活的路由
    defaultRouter() {
      let router;
      Object.keys(this.routers).some((key) => {
        if (!this.routers[key].hidden) {
          router = this.routers[key].path;
          return true;
        }
      });
      return router;
    },
    hasOneShowingChild(children = [], parent) {
      if (!children) {
        children = [];
      }
      const showingChildren = children.filter(item => {
        if (item.hidden) {
          return false
        } else {
          // Temp set(will be used if only has one showing child)
          this.onlyOneChild = item
          return true
        }
      })

      // When there is only one child router, the child router is displayed by default
      if (showingChildren.length === 1) {
        return true
      }

      // Show parent if there are no child router to display
      if (showingChildren.length === 0) {
        this.onlyOneChild = { ... parent, path: '', noShowingChildren: true }
        return true
      }

      return false
    },
    // 菜单选择事件
    handleSelect(key, keyPath) {
      console.log(key, keyPath)
      this.currentIndex = key;
      if (this.ishttp(key)) {
        // http(s):// 路径新窗口打开
        window.open(key, "_blank");
      } else if (key.indexOf("/redirect") !== -1) {
        // /redirect 路径内部打开
        this.$router.push({ path: key.replace("/redirect", "") });
      } else {
        console.log("显示左侧联动菜单")
        // 显示左侧联动菜单
        this.activeRoutes(key);
      }
    },
    // 当前激活的路由
    activeRoutes(key) {
      var routes = [];
      if (this.childrenMenus && this.childrenMenus.length > 0) {
        this.childrenMenus.map((item) => {
          if (key == item.parentPath || (key == "index" && "" == item.path)) {
            routes.push(item);
          }
        });
      }
      if(routes.length > 0) {
        this.$store.commit("SET_SIDEBAR_ROUTERS", routes);
      }
      return routes;
    },
    ishttp(url) {
      return url.indexOf('http://') !== -1 || url.indexOf('https://') !== -1
    }
  },
};
</script>

<style lang="scss">
.topmenu-container.el-menu--horizontal > .el-menu-item {
  float: left;
  line-height: 50px !important;
  color: #999093 !important;
  padding: 0 5px !important;
  margin: 0 10px !important;
  font-size: 16px !important;
  height: 100%  !important;
  display: flex !important;
  flex-direction: row !important;
  justify-content: center !important;
  align-items: center !important;
}

.el-menu--horizontal > .el-submenu {
  float: left;
  height: 100%;
  display: flex;
  flex-direction: row;
  justify-content: center;
  align-items: center;
}

.topmenu-container.el-menu--horizontal > .el-menu-item.is-active, .el-menu--horizontal > .el-submenu.is-active .el-submenu__title {
  border-bottom: 2px solid #{'var(--theme)'} !important;
  color: #fa8919 !important;
}

.el-menu--horizontal .el-menu .el-menu-item.is-active, .el-menu--horizontal .el-menu .el-submenu.is-active > .el-submenu__title {
  color: #fa8919 !important;;
}

/* submenu item */
.topmenu-container.el-menu--horizontal > .el-submenu .el-submenu__title {
  float: left;
  height: 50px !important;
  line-height: 50px !important;
  color: #999093;
  padding: 0 5px !important;
  margin: 0 10px !important;
  font-size: 16px !important;
  height: 100%  !important;
  display: flex !important;
  flex-direction: row !important;
  justify-content: center !important;
  align-items: center !important;
}

.el-menu--horizontal .el-menu .el-menu-item, .el-menu--horizontal .el-menu .el-submenu__title {
  background-color: #FFFFFF;
  float: none;
  height: 36px;
  line-height: 36px;
  padding: 0 10px;
  color: #909399;
  font-size: 16px;
}
</style>

